2022 freightliner cascadia adaptive cruise control not working

A major concern is that the fault can inhibit other functions on the truck. In some instances, a regeneration may be prohibited until the adaptive cruse fault is corrected and cleared. This can be a costly experience if the driver requires a forced regen on the side of the road to get the truck moving again. Rather than force it on site, or have one forced with an application like Tripvision Uptime, fleets may have to call a mobile repair service.

For three or more years, the faults occurred at a high rate, yet are mostly seen by the owners of newer trucks and dealerships or service centers who perform warranty repairs. As these vehicles began to age, fleets with longer trade cycles and service centers that commonly repair trucks after warranty periods end will begin to experience this issue and must be prepared to solve the problem.

Fortunately, in most instances the solution to the adaptive cruise control is simple and could even be applied roadside, assuming the driver is relayed the proper instructions. Unlike cruise control in the automotive industry, adaptive cruise control on trucks utilizes a control switch that remains enabled upon startup, assuming it was activated before the truck shut down.

We found these faults were overwhelmingly triggered shortly after a truck powered on and reached a speed equal or greater than five miles per hour. With drivers stopping for food, fuel, sleep, or any other reason multiple times during a trip, the likelihood of adaptive cruise switch remaining in the on position while the truck went from shutdown to driving again was high.

The repair is simple – turn off the adaptive cruise control switch before allowing the truck to reach the five-mph mark. For technicians, it is best practice to turn this switch off before pulling a truck into the bay, else he or she risks triggering a fault that could inhibit other functions needed while in the bay.

Do not use the cruise control system when driving conditions do not permit maintaining a constant speed, such as in heavy traffic or on roads that are winding, icy, snow-covered, slippery, or roads with a loose driving surface. Failure to follow this precaution could cause a collision or loss of vehicle control, possibly resulting in personal injury or property damage.

When the cruise control is engaged, do not attempt to shift gears without using the clutch pedal. Failure to follow this precaution will result in a temporarily uncontrolled increase in engine speed. Transmission damage and gear stripping could result.

IMPORTANT: On vehicles equipped with VORAD Collision Warning System with SmartCruise, see Chapter 6 before operating the cruise control.

NOTE: If the vehicle is equipped with a Detroit multifunction control, setting the cruise control with the engine brake on will activate Descent Control Mode. Moving the lever to the top position will resume the set cruise speed. Moving the lever down to engage the engine brake after the cruise control has been set will activate Deceleration Mode. See "Descent Control and Deceleration Modes, Detroit™ Automated Transmissions" in this chapter.

The cruise control is operated by four buttons mounted in the left-hand button pod of the steering wheel. See Fig. 5.7 .

ON/OFF Button—Press to turn cruise control on or off. When cruise control is on, a green telltale illuminates in the ICU. The speed memory will be retained until the cruise control is disabled with the ON/OFF button, or the ignition is turned off.

DEC/SET Button—Press to set the cruise speed while the vehicle is traveling at the desired speed. Press and hold to decrease the set cruise speed.

CNCL Button—Press to pause the cruise control, while retaining the speed setting in memory. The cruise control can also be disengaged, while retaining the speed memory, by depressing the brake or clutch pedals.

ACC/RES Button—Press to resume the set speed. Press and hold to accelerate the set cruise speed.

1.

To cruise at a particular speed:

1.1

Press the ON/OFF button to turn cruise control on.

1.2

Depress the accelerator pedal until the speedometer reaches the desired speed.

NOTE: Cruise control is cancelled if the brake or clutch pedal is depressed, or vehicle speed drops below the minimum cruise control speed.

1.3

Press the DEC/SET button to set the desired speed.

NOTE: The speed memory is lost whenever the ignition switch is turned to OFF, or cruise control is turned off.

2.

To disengage the cruise control, do one of the following:

Depress the clutch pedal (on a manual transmission only).

3.

To resume a preselected cruise speed:

3.1

Ensure cruise control is on.

3.2

Press the ACC/RES button. Cruise will return to the last set speed.

NOTE: If vehicle speed drops below the minimum cruise control speed, cruise control will disengage. To resume to the preselected cruise speed, increase vehicle speed to above minimum cruise control speed and press the ACC/RES button.

4.

To increase cruise speed, press the ACC/RES button until the vehicle accelerates to the desired speed.

5.

To decrease cruise speed, press the DEC/SET button until the vehicle decelerates to the desired speed.

Run Smart Predictive Cruise™

Predictive Cruise Control (PCC) is an optional fuel savings application that adjusts vehicle speed predictively, based on the approaching road. Using 3D digital map technology and GPS, PCC evaluates the upcoming road grade about a mile in advance to determine the most fuel-efficient vehicle speed. Vehicles equipped with PCC have a sticker on the dash. See Fig. 5.23 .

Fig. 5.23, Run Smart Predictive Cruise Control Sticker

The 3D digital map database contains profile information for over 200,000 highway miles (322,000 km) in the 48 contiguous United States. PCC will vary the set cruise speed by up to 6% depending on the approaching road grade. If the engine brake is enabled, PCC will automatically engage the engine brake when actual vehicle speed exceeds the cruise set speed by 6%. This is different from conventional cruise control, which maintains the speed set by the driver.

Apply the brakes and downshift as necessary when driving on downhill grades. PCC does not adequately control vehicle speed on steep downhill grades. Failure to use normal braking techniques when PCC is active could result in personal injury and vehicle damage.

IMPORTANT: PCC adjusts the vehicle set speed to achieve maximum fuel economy, but it does not account for traffic flows or surrounding vehicles.

Driver interaction with PCC is the same as conventional cruise control, using the standard cruise control buttons. In the event of a problem with PCC, or when driving on a road with no profile information available, the system reverts to conventional cruise control.

Cruise Control ("CC") Limiter

On vehicles equipped with a CC Limiter (or CC Band) switch (see Fig. 5.24 or Fig. 5.25 ), the cruise control limiter allows the vehicle to exceed the set cruise control speed before engine braking is applied. The CC limiter switch provides more flexibility to the existing cruise control limit function, allowing the driver to tune the cruise function to better suit driving preferences and conditions. To select a limit, use the three-position CC Limiter switch on the dash. See Table 5.1 for switch settings.

Fig. 5.24, CC Limiter Switch

Fig. 5.25, CC Band Switch

Table 5.1, CC Limiter Switch Settings

Descent Control and Deceleration Modes, Detroit™ Automated Transmissions

On vehicles equipped with a Detroit multifunction control ( Fig. 5.26 ), the functions of the lever positions for engine brake control change when cruise control is set. Two distinct modes can be activated:

Descent Control Mode—engine braking keeps the speed below cruise set speed; throttle is not automatically applied.

Deceleration Mode—engine braking activates to reduce vehicle speed (with no lower limit) at a constant rate.

Descent Control Mode

Descent Control Mode keeps the vehicle speed below the set cruise speed on a downhill.

To activate Descent Control Mode, set the cruise control speed with the engine brake on ( Fig. 5.26 , positions 1, 2, or 3). In this mode, all three levels of engine braking will be employed to to keep the speed below the set cruise speed. This mode will not keep the speed above the lower limit of the set speed, so it is possible to eventually coast to a stop, unless the lever is moved to "engine brake off" (position 0), or throttle is applied. After throttle application, the Descent Control Mode is resumed.

Moving the lever to "engine brake off" (position 0) cancels Descent Control Mode and resumes cruise speed. To reactivate Descent Control Mode, reset the cruise control speed with the lever in position 1, 2, or 3.

0. Resume cruise control set speed.

1, 2, 3. Descent Control maintains set speed.

Fig. 5.26, Descent Control Mode Positions, Detroit Multifunction Control

Deceleration Mode

Deceleration Mode reduces the vehicle speed at a constant rate.

With the cruise control speed set, activate Deceleration Mode by moving the lever to engine brake on ( Fig. 5.27 , position 1, 2, or 3). This mode engages one of the engine brake levels, depending on the lever position. The vehicle will decelerate at a constant rate until the vehicle comes to a stop, unless throttle applied to override the deceleration, or the lever is moved to "engine brake off" (position 0).

Moving the lever to position 0 resumes the previously set cruise control speed.

• 0. Resume cruise control set speed.
• 1. Low
• 2. Medium
• 3. High

Fig. 5.27, Deceleration Mode Positions, Detroit Multifunction Control

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